We Are Not Alone

This is one of the shortest episodes in Opposing Force, but also one of the most memorable. It revisits one of the best moments of Half-Life, and contains a few other secret goodies if you know where to look.

Upon starting the episode, you'll hear a scientist calling out to someone, telling him to "hurry before the portal closes". As fast as you can race around to the lab doorway, you'll only be able to catch a glimpse of everyone's favorite scientist as he jumps into the teleporter.

You'll then be left with a bunch of floating aliens looking to do you harm. Heading around the teleporter, a catwalk will collapse, making a ramp with a teleportation ball at the top. Run up the makeshift ramp and jump into the glowing teleporter....

After entering the transporter, you'll reappear high upon a floating ledge in a alien world. Gravity is much lower here, and your goal will be to jump from ledge to ledge to reach a teleport ball high in the sky. You'll need to use the alien jump pads found on a few platforms, and you should save often here, as one false step will spell certain doom.

Your first jump should put you in view of a dead scientist, who has just recently transported himself here. Jump over and pick up the transporter gun next to him.

Side Note: If you use the gun's secondary fire, you'll be transported to the "Hazard Course" from Half-Life (!), where you'll find a very confused Vortigaunt swiping at the holographic trainer, to no avail. If you climb up the side of the room, you can break the window to the observation area, and use a med station to heal yourself if necessary. The teleport ball there will send you back exactly to where you came from, on the floating ledge with the dead scientist. You can also use the transporter gun at any time to send yourself back to various locations in Xen to heal yourself at any time (provided you have ammo for the gun.)

From here, look up and try to spot a few houndeyes on a ledge high above. Your goal will be the ledge next to them. To make the jump, you'll have to run onto the jump pad moving in the direction of your destination, and your momentum will carry you over. Otherwise, Xen's air physics will not allow you to maneuver to the ledge.

Once on the platform near the houndeyes, it should be easy to reach the glowing teleport ball in the sky. Upon teleporting, you'll find yourself in an underwater lab...